Question -The set representing the correct order of first ionization potential is?
Options:
A .  K > Na > Li
B .  Be > Mg > Ca
C .  B > C > N
D .  Ge > Si > C
Answer: Option B : B Down the group ionization enthalpy decreases with an increase in atomic size. Along theperiod it increases due to an increase in effective nuclear charge and decrease in size. K > Na > Li ---> same group, going upwards ---> so decreasing Be > Mg > Ca ---->same groupbut going downwards, so it should increase. B > C > N ---> same period, going left to right ---> so increasing Ge > Si > C ----> same group, going upwards. ---> so decreasing
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